To me, there are three types of games to play: stock class, pump, and open. Beyond that, controlling quantity of paint is the only other variable.

If you want a "primitive" game of pump, spell it out as stock class or a modification thereof. If not, deal with the Chipleys and force feed hoppers. Getting into "AT isn't allowed" or "you can only use X gun" limits your player base and will likely result in pretty crappy days of play.

If you don't want lots of paint in the air, restrict it before the game starts.